Question

Write two chemical tests for the confirmation of unsaturation present in the hydrocarbons. Take ethene as a reactant and complete the chemical reaction​

Answer 1

Answer:

Bromine water is mild oxidising agent. It oxidises glucose to gluconic acid. Decolourisation of bromine water indicates positive test and confirms presence of one −CHO group in the glucose.

HOCH

2

−(CHOH)

4

−

O

∣∣

C

−H

[O]

HOCH

2

−(CHOH)

4

−

O

∣∣

C

−OH

2) When glucose reacts with acetic anhydride in presence of sulfuric acid, a penta acetyl derivative of glucose is obtained. It confirms that glucose has 5-OH groups.

HOH

2

C(CHOH)

4

−CHO+5Ac

2

O→AcOH

2

C(CHOAc)

4

−CHO+5AcOH